Table of Contents
Advertisement
GENERAL INFORMATION
The digital road map
To plan a route to a destination address not only the current car position is needed by
the navigation system but also a digital road map is required where the destination
address itself as well as the roads leading to the destination address are stored. This
digital road map is located on the map CD you insert in your navigation computer.
On the map CD the road network is stored as a line pattern, which means that even
extensive junctions have only one central point that all roads lead to.
Real road network
Line pattern of digitized map
That's why the navigation system indicates the distance to the next turn as the
distance to the centre of the junction. Therefore the distance indications for motorway
exits given by the navigation system are different from those on the motorway signs.
The motorway signs refer to the distance to the beginning of the exit.
Areas with limited road attributes
In some areas not all attributes of a road are available on the map CD. For example
information on prohibited turning, one way streets or pedestrian areas are missing.
If you are entering this kind of area the navigation system will show you a warning.
The local traffic regulations always have priority over the advice given by the
navigation system. Always obey road signs and traffic regulations.
Latest map CDs
Approximately 10-15 % of the traffic network is changing each year. Due to these
constantly changing conditions (newly built roads, traffic restrictions, etc.), a 100 %
correspondence of the digital roadmap with reality cannot be achieved under all
circumstances. We recommend to always use the latest version of the map CD for
navigation.
13
Advertisement
Table of Contents
